I'll bite
What's a F5Q?
Welcome to new levels of geekdom. The F5Q is a Federation and Empire term. It is a three-ship unit the includes an F5C, an F5, and an F5S.
What is the F5? Why is not not really a frigate, and not really a destroyer? How did it manage to both suck and be the most successful design in the entire SFB galaxy at the same time? The answer lies in the way that the Klingons deployed their ships.
The Klinks use a quantity over quality philosophy, and they rarely deployed their F5's individually. Instead they formed them into FF squadrons of one leader, one standard, and one scout, and treated this group as a single entity. When F&E gives the historical OOB for various fronts, it doesn't even mention how many F5s are in the theater; just how many F5Q's. They even provide F5Q counters to move around on the map.
One thing the Klinks suffered from in my Four Powers War campaign years ago (aside from the broken Hydran AI matching.....) was that you couldn't model the fact that they had more expendable ships than either of their enemies. The Klinks had only the pilots that logged onto the server and each pilot could only take up to three ships; just like every other race. Even numbers of pilots was actually a disadvantage for the Klinks.
When that campaign ended, I thought for a while and wondered if the F5Q might help the Klinks feel more klink-like. It would be three ships that only took one slot. However, two starships that acted, commanded, and took plas-D like a fighter left me a little unsatisfied.
Now two-thirds of that problem are solved. The F5 and the F5S would accept commands like a starship, and they would be immune to plas-d like a starship. The only remaining glitch is that when you lose the F5C, the F5 and the scout go with it. At this point I think I can live with that.
-Herr Burt